(a)  
Replace the nuts or screws if it is necessary.

 (b)  
Attach the nutplates with rivets if the nutplates are loose.

 S 434-030
 WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE AREA
_______ BELOW THE LEADING EDGE. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF THE EQUIPMENT FALLS.
 (6)  
Put the part of the leading edge in the correct position.

 S 354-031

 (7)  
If you install a new part of the leading edge, do the steps that follow:

 (a) Cut the edges of the new part of the leading edge skin.
 NOTE: Make sure you have the correct clearance between the
____ parts of the leading edge (View A-A, Fig. 401).
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747-400 MAINTENANCE MANUAL
 (b)  
Break the sharp edges of the skin you cut.

 (c)  
Apply a layer of clear Alodine (Ref 51-21-04/701).

 S 434-034
 (8)  
Install the fasteners that attach the parts of the leading edge to the horizontal stabilizer.

 S 224-019

 (9)  
Make sure the fastener heads are smooth with the leading edge skin.

 NOTE:____ The maximum distance below the surface is 0.010 inch.
 The maximum distance above the surface is 0.002 inch.  Do not
 cut the fastener heads to get the correct flushness.

 S 344-020
 (10) Fill the clearance between the parts of the leading edge with sealant (Ref 51-31-01/201).
 NOTE: Make sure the flushness is less than | 0.01 inch.
____
 S 864-021
 (11)
 Remove the placard from the manual control lever if you attached one.

 S 864-022

 (12)
 Connect the electrical power (Ref 24-22-00/201).

 S 864-023

 (13)
 Close these circuit breakers and remove the DO-NOT-CLOSE tags:

 (a)  P7 Overhead Circuit Breaker Panel 1) 7E7 STAB TRIM L S/O VALVE 2) 7E20 STAB TRIM R S/O VALVE
 S 864-024
 (14) Put the STAB TRIM NO. 2 and NO. 3 switches in the NORM position.
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 HORIZONTAL STABILIZER TIP - REMOVAL/INSTALLATION
________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is the removal of the horizontal stabilizer tip. The second task is the installation of the horizontal stabilizer tip.
 B.  The procedure that follows refers to the horizontal stabilizer tip as the tip.
 C.  The tip has a forward, middle, and an aft fairing. The forward and aft fairings are an aluminum alloy sheet. They attach to the fiberglass middle fairing with rivets. Thus, you remove the three fairings together as one unit.
 TASK 55-10-02-004-001
 2.  Remove the Horizontal Stabilizer Tip____________________________________
 A.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
IPC 55-10-02-02

 B.  Access
 (1)  Location Zone
 337 Horizontal Stabilizer Tip, Left
 347 Horizontal Stabilizer Tip, Right

 C.  Procedure
 S 864-002
 WARNING: APPLY ELECTRICAL POWER TO OPEN THE STABILIZER TRIM SHUTOFF TO
_______ PREVENT HYDRAULIC OPERATION OF THE STABILIZER. IF ELECTRICAL POWER IS NOT AVAILABLE, ATTACH A PLACARD TO THE MANUAL CONTROL LEVERS FOR THE HORIZONTAL STABILIZER. ACCIDENTAL OPERATION OF THE HORIZONTAL STABILIZER CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Connect the electrical power (Ref 24-22-00/201).

 S 864-003

 (2)  
Put the STAB TRIM NO. 2 and NO. 3 switches on the control stand to the CUTOUT position.

　
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